"The ISIL fortified positions near Tishrin Dam, which is over the Euphrates river at the border of Raqqa and Aleppo provinces, came under the joint combat sorties of the Syrian and Russian air forces," the sources said.
"Following the Syrian government forces' plan to carry out an imminent large-scale operation to end the ISIL occupation of the strategic Tishrin Dam, the Syrian and Russian fighter jets targeted the headquarters and defense lines of the ISIL terrorists in both sides of the river, which claimed the lives of many militants and destroyed the military infrastructures," the sources said.
"In the meantime, the ISIL gathering centers in al-Bab, Deir Hafer, Jrouf, Sharbeh, Jubb Ghabsheh in the Northeastern part of Aleppo province were bombed by the Russian and Syrian air fleets," the sources said.
"There were no immediate reports on the possible casualties of the ISIL terrorists in the airstrikes," the sources pointed out.
On Monday, intelligence sources of the Syrian Army disclosed that the country's government forces have dispatched fresh fighters in groups to Sarrin Northeast of Aleppo province to join a large-scales operation against the ISIL strongholds Northwest of Raqqa.